First, multiple-choice questions. (Please fill in the answer sheet, with 3 points for each question and 36 points for * * *).

1, as shown in figure: ∠ AOB = ∠ COD = 90,

∠AOD:？ ∠ BOC = 5: 1, then ∠ ∠AOD is: (? )

60? b、 120

c、 150 D、 160？

2. If ∠ 1+∠ 2+∠ 3 = 180? What is impossible in ∠ 1, ∠2. ∠3 Yes: ()

A, there are two acute angles and a right angle. ?

B, two acute angles and an obtuse angle.

C has two obtuse angles and an acute angle.

D, all acute angles.

3. As shown in the figure, lines A and B intersect with line C, which can be

Judge? a‖b？ The conditions are: ()

( 1)∠ 1=∠2,

(2)∠3=∠6,

(3)? ∠ 1=∠8,

(4)∠5+∠8= 180

a 、( 1)(3)？ (2) and (4)?

c 、( 1)3)4)D 、( 1)2)3)4)

4, known ∠ mon = 30,? ∠ nop = 15, then ∠MOP is: ()

A, 45 B, 15 C, 45 or 15 D, uncertain.

5. Given that one side of two angles is on the same straight line and the other side is parallel to each other, the relationship between the two angles is: ()

A, equal b, complementary c, complementary? D, equality or complementarity?

6. The image with function y = 3x-2 has no ().

A, the first quadrant B, the second quadrant C and the third quadrant? D, quadrant four?

7. The following function Y is a proportional function of X: ()

a、y=3x2B、y=5-4x？ c、y=xD、y=-6+x

8. There are two points (x 1, y 1) on the function y =-2x+3, (x2, y2) and x 1 < x2.

So the relationship between y 1 and y2 is:? ()

a、y 1>y2B、y 1=y2C、y 1